To add to Armel2528's comment and the subsequent response about marking things "doll-friendly" what are the properties of the LARP sword? It's an object that does no damage. If you could apply that property (just like you can apply sharpness I suppose) to other objects then the desired effect could possibly be achieved.
 "Mutilate-a-Doll 2"){kind=icon}
 "Mutilate-a-Doll: Classic"){kind=icon}
It's just very lightweight. Not optimal for some designs (e.g. 1% weight car would just buckle under a doll's weight)